Red outlines, cyan overlay (using collision boxes)
Yellow glowing effect outline
Blue model overlay, red custom outline, cyan hitbox outline (increased line width) and yellow hitbox overlay.
White block overlay using collision models
Endercrystal with a cyan hitbox overlay
Blue custom outline
A red model overlay with a cyan glowing outline
Fence collision boxes are 1.5 blocks tall, the blockCollisionClamped option forces the overlay to stay within a 1x1x1 block.